Furnace



J. DOERSOM.

FURNACE.

APPLICATION FILED JUNE 19, 19:9.

Suva/"42oz Iv/31720050222 Patented May 17, 1921.

in stares :ronn' nonnsoivr, or cornrasus, orrio.

FURNACE.

Specification of Letters Patent;

Patented May W, 1921.

Application filed June 19, 1919. Serial No. 305,256.

T 0 aZZ w ham it may concern Be it known that 1, JOHN DOER'SOM, a citi-' zen of the United States, residing at Columbus, in the county of Franklin and State of.

Ohio, have invented certain new and useful Improvements in Furnaces, of which the following is a specification. v

This invention relates to furnaces and has particular reference to that type of fun nace employed for reducing metal {to ja' molten state, or to other similar furnaces wherein a high degree of heat is obtained.

The primary object of the present invention is to provide a furnace wherein is formed a foundation or crucible support and a spaced and concentrically disposed'outer wall, and wherein said foundation or base is extended belpgv the outer wall and in spaced relation therefrom so that material boiling over the edges of the crucible and engaging the foundation will be caused to flow or drop to such a position as to permit the same to be readily removed from the fur nace and to further prevent such clogging matter from accumulating within the furnace and retarding its heating action.

With these and other objects in view, as will appear as the description proceeds, the invention accordingly consists in the novel features of construction, combination of elements and arrangement of parts, hereinafter to be fully described and to have the scope thereof pointed out in the appended claims.

In the accompanying drawing:

Figure 1 is a vertical longitudinal sectional view taken through a furnace con? structed in accordance with the principles of the invention.

Fig. 2 is a transverse sectional view, taken along the line 22 of Fig. 1.

Similar characters of reference denote like and corresponding parts throughout the views of the drawing.

Referring more particularly to the details of the invention, the latter consists of a foundation or base 1, which is preferably constructed of blocks formed from any suitable refractory material and is preferably built vertically upward from the base or floor line 2 of a pit structure 3. Concentrically surrounding the foundation 1 and in spaced relation from the latter is an outer wall or setting 4, which, also, is formed from relatively thick blocks of refractory material and is bounded upon its outer side by means of a metal casing 5. A top 6 rests upon the upper annular edge of the setting 41 andis of a removable nature so that a crucible 7 may be inserted within the setting 4 and rest upon the upper block 8 of the foundation 1. Thetop 6 is also formed with the usual central opening 9, by means of whichv its removal from the setting may be facilitated. I

Connected with the wall or setting a is a metallic member 10, which forms a part of a source of fuel supply, and said member 18 centrally bored as at 11 to register with an outlet opening 12 formed in the setting 4-, said outlet being located substantially on the same horizontal plane as the block 8. in order to prevent the intense heat emitted from the port or outlet 12 from cracking the crucible by intensely engaging with isolated portions thereof, said block8 is of substantially' heart shaped configuration,

. with its apex located immediately in front of the outlet 12,'as shown in Fig. 2. By so forming the block, the flame emitted from the port 12 1s equally spread or divided so as to pass around both sides of the block 8 and in this manner to completely encircle the crucible 7, so that the back of said crucible will be heated with substantially the same efficiency as the portions thereof which are located nearest to the fuel port 12. Thus a structure has been provided wherein the heat emitted by said port is prevented from exertmg its maximum effect upon any localized portionof the crucible 7, but on the contrary is permitted to envelop the crucible so that all portions of the latter will be heated to a substantiallyv equal extent.

In many of the furnaces of the prior art, the molten material overflowing the edges of the crucible frequently accumulates around the base 1 in such manner as to arrest or retard theheating efficiency of the furnace by choking up the port 12, and furthermore considerable difficulty is to be had in effectively removing this accumulated matter. Therefore, the present invention provides an annular space 13 between the foundation 1 and the setting 4, and said setting is formed to terminate an appreciable distance above the floor line 2. In this instance, said setting is supported by means of a pair of rail members 14:, which are suitably mounted or embedded in the side walls of the pit structure so as to receive the weight of the setting. Thus, the space 13 is in open communication with the accessible pit structure 3 so that material entering said space will fall down into the pit structure and in this manner will be prevented from choking up the action or draft of the furnace. ltwill be observed that the matter deposited within the pit structure may be readily removed so that the cleaning of the furnace is rendered comparatively simple.

From the foregoing description taken in connection with the accompanying drawing, it will be apparent that there is provided a structure of considerable utility, and one particularly adapted for carrying out the aims of the present invention. The furnace is practically self cleaning in that extraneous matter is permitted to fall out of the furnace proper so that manual attention is not required during the active operation of the furnace. This result is primarily accomplished by the provision of the space 13 which is so arranged as to be in free communication with the pit structure to permit material toreadily pass therethrough and out of the furnace.

I claim:

1. In a flame heated furnace, a foundation including an open pit, a pedestal of refractory material arising vertically from said foundation and capable of supporting a crucible on the top thereof, an open bottomed casing located above said pit and formed to surround said pedestal and crucible forthe purpose of defining a heating chamber, said latter having its lower end in open communication with said pit, and flame introducing means entering said casing at a position immediately below said crucible and substantially midway of the height of said casing.

2. In a flame heated furnace, a foundation therefor, including a substantially open pit, a pair of spaced rigid supports arranged substantially above said pit, an open bottomed casing of refractory material positioned upon said supports, there being removable cover upon the top of said casing, a pedestal of refractory material arising vertically from the bottom of said founda tion and positioned within and in spaced relation from the inner sides of said casing, burner mechanism entering-the interior of said casing ata position substantially mid way of the height of said casing and on a plane substantially common with that of the upper-end of said pedestal, whereby a crucible may be supported upon the upper surface of said pedestal in juXta-position with respect to said burner means.

In testimony whereof I afliX my signature.

JOHN DOERSOM. 

